Multiple-fuse plug



B. L, MOSS AND J. SCHURY.

MULTIPLE FUSE PLUG.

APPLICATION FILED DEC. 27. 1919.

Patented Dec. 5, 1922.

' vertical section. Fig. 5 is a section on the Patented Dec. 5, 1922UNITED STATES BENJAMIN L. MOSS AND JOHN SCHURY, OF DETROIT, MICHIGAN.

MULTIPLE-FUSE PLUG.

Application filed December 27, 1919. Serial No. 347,746.

To all whom it may concern:

Be it known that we, BENJAMIN L. Moss, a citizen of the United States,and JOHN SoHURY, a subject of the Government of Austria, residing atDetroit, in the county of Wayne and State of Michigan, have inventedcertain new and useful Improvements in Multiple-F use Plugs, of whichthe following is a specification.

In our'pending application No. 333,957 there is disclosed a fuse plug ofthat type used in connection with electric light sockets or the like,there being a plurality of fuses which are successively brought intooperative position, so that when one fuse. blows, another may beconnected, the successive connections being made by turning a centralblock which carries the fuses.

The object of the present invention is to improve the fuse plugdisclosed in said application, particularly with respect to theconstruction of the fusible member, and with respect to other featuresas will more. fully appear from the following description.

The invention is illustrated in the accompanying drawing in which Fig. 1is a side elevation of the plug. Fig. 2 is a side elevation of the blockor member which is r0- tatable within the casing or outer part of theplug. Fig. 3 is a top view of the casing with the plug removed. Fig. 4is a central line 55 of Fig. 4. Fig. 6 is a plan of the fuse elementbefore it is bent to final shape.

The plug comprises an outer casing or cylindrical member 6 having anenlarged upper part 7. This is made of porcelain,

fiber, or other insulating material, and is.

provided externally with a threaded conducting shell 8, which screwsinto the ordinary socket, not shown. The plug is closed at the inner endand is provided with a central contact pin 30 fitting snugly in an 0ening in the mner end of the casing. he shell 8 is electricallyconnected by a metal strip 22 to a contact spring and detent 23 whichprojects into the bore or hollow part of the casing.

Fitting within; the casing, in such manner that it may be turnedtherein, is a circular block 9, made of insulating material, and theexterior of this block is provided .with a plurality of equally spacedlongitudinal grooves 10, each of which receives one of the arms 11 of amultiple fuse member conveniently made of sheet metal, the

arms radiating in the blank, from a central circular part 12, as shownin Fig. 6. When this member is assembled on the block, the central part12 fits in a recess in the inner end of the block, and each of the armsis bent up to he within one of the grooves 10 in the side of the block,and when the block is assembled in the casing the central part 12 is incontact with the upper end of the pin 30 and so makes electricalconnection between said arms and the central contact of the plug. Eachof the arms 11 is reduced in width, as indicated at 11a, to make aweakened neck portion, which may be varled according to the desired orintended capacity of the fuse.

The outer ends 15 of the arms 11 form contact plates or portions, eachof which rests in a ratchet notch or depression v16 formed in the rim 17of the block 9, and thls rim fits and turns in an annular channel ordepression 16 in the top of the casing. Above the notched rim the block9 has a flange 19 which rests against a shoulder 20 in the top of thecasing, and the block 9 is also provided with a finger piece 21 whichmay be grasped to turn the block to bring the successive fusible armsinto the circuit. A cap 24 is screwed on the top of the plug and has anopening through which the finger piece 21 projects.

When the block 1s assembled in the casing the end 15 .of one of the armsis in contact with the finger 23, and the circuit may be traced from theshell 8 through the connection 22 to the spring contact 23, thecontact-15, arm 11, plate 12 to the central contact pin or stud 30.

In use, if the connected fuse blows, it is merely necessary to turn theblock 9 until the spring piece 23 snaps into the next notch 16 intoconnection with the plate 15 and next arm 11, thereby connecting anewfusible arm in the circuit; and so the block may be turned to bringsuccessive fuses into osition as fast as they burn out. When all t earms are fused the cap 24 may be taken off and the block 9 lifted outand a new fuse plate substituted. By making all the fuses from a. singleblank or piece the construction is cheapened and all soldering isavoided;

We claim 1. In amultiple successive fuse plug, the

combination with a casing having a contact, of a rotatable block in thecasing having i and an outer shell contact, of an externally groovedblock rotatable in the casing, and

a contact member carried by the block, said member having a central partat the inner end of the block and in contact with said pin and aplurality of integral fusible arms 20 located in the grooves and havingreduced necks adjacent said chamber. said arms adapted to besuccessively closed upon said shell contact by turning the block.

In testimony whereof, we hereby aifix our 25 signatures in presence oftwo witnesses.

BENJAMIN L. MOSS. JOHN SOHURY. Q

Witnesses CHARLES W. TANN, IDA 'HAGEN.

